Hydraulic Work Machine Integrated Control Unit

Solution Overview

Problem

Conventional hydraulic working machines, such as hydraulic excavators, face challenges with the layout and manufacturing costs due to the large number of components required for the travel speed control unit and boost control unit, which are often independent and space-intensive.

Innovation Solution

A hydraulic working machine design that incorporates a single hydraulic pressure oil feed part for both the travel speed control unit and boost control unit, utilizing a hydraulically-actuated tilt-angle control device and an adjustable relief valve, with a solenoid valve and controller to manage the tilt angle and relief pressure based on selector switch inputs, reducing the number of components and layout space needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If independent travel speed control unit and boost control unit are used, then control functions are complete, but device complexity and layout space increase

Engineering Contradiction:

Improvecontrol function completenessVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the travel speed control unit and boost control unit into a single integrated control system. The common hydraulic pressure oil feed part supplies pressure oil to both the tilt-angle control device (for travel speed control) and the relief valve (for boost control), eliminating the need for separate hydraulic systems and reducing overall component count while maintaining both control functions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The hydraulic pressure oil feed part is designed with multi-functionality, serving both the travel speed control unit and the boost control unit. By using a single hydraulic pressure oil feed part that can supply pressure oil to multiple control components, the system achieves universality, reducing device complexity while ensuring complete control functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If independent travel speed control unit and boost control unit are used, then control functions are complete, but layout space increases

Engineering Contradiction:

Improvecontrol function completenessVSAvoidlayout space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the travel speed control unit and boost control unit into a single integrated control system. The common hydraulic pressure oil feed part supplies pressure oil to both the tilt-angle control device (for travel speed control) and the relief valve (for boost control), eliminating the need for separate hydraulic systems and reducing overall component count while maintaining both control functions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The hydraulic pressure oil feed part is designed with multi-functionality, serving both the travel speed control unit and the boost control unit. By using a single hydraulic pressure oil feed part that can supply pressure oil to multiple control components, the system achieves universality, reducing device complexity while ensuring complete control functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design reduces the number of components and layout space required, lowers manufacturing costs, and ensures efficient operation by forcing travel speed reduction during high loads and increasing relief pressure when needed, enhancing safety and workability.

Implementation Method 1

a switching solenoid valve, which is driven and controlled by a signal outputted responsive to a switching manipulation of the switch and can feed pressure oil to actuate the tilt-angle adjusting cylinder

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

pilot pressure oil from the pilot pump is not fed to the tilt-angle adjusting cylinder so that the tilt angle is maintained large

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 3

an adjustable relief valve operably arranged to control a preset relief pressure at which a maximum delivery pressure of the main pump is to be regulated

Methodology Applied

Scientific EffectRelief pressure control: Hydraulic Press

Data Source

PatentUS8521374B2Hydraulic work machine

Publication Date: 2013.08.27 HITACHI CONSTRUCTION MACHINERY CO LTD

AI summary

A hydraulic working machine, typically a hydraulic excavator has a travel speed control unit and a boost control unit. The travel speed control unit includes a traveling, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate traveling tilt-angle control devices. The boost control unit includes a boosting, hydraulic pressure oil feed unit capable of feeding pressure oil to actuate an adjustable relief valve. A single hydraulic pressure oil feed unit is commonly usable as the traveling, hydraulic pressure oil feed unit and the boosting, hydraulic pressure oil feed unit, and includes lines communicating with both of the traveling tilt-angle control devices and the adjustable relief valve, a solenoid valve for opening or closing these lines, and a controller for outputting a control signal to control the solenoid valve.